Tried fishing with vanilla and AQ2 rods and have not caught a single frog or turtle.

Also, if they have in rendered mobs, they do not spawn.

Did notice that pufferfish can be caught in swamps. (Might be because they are vanilla)

They're just both quite rare catches.
Turtles does have a mob entity too, but is equally as rare. Can be changed in the config.
Yea pufferfish are just vanilla - vanilla don't care about biomes for the fish, only for bambo for some reason.

What setting do I need to change in the config? Please provide a sample of the code I'm looking for,